3944278891 has 8 divisors (see below), whose sum is σ = 4508200160. Its totient is φ = 3380470848.

The previous prime is 3944278889. The next prime is 3944278969. The reversal of 3944278891 is 1988724493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3944278891 - 2¹ = 3944278889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3944278801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68365 + ... + 112081.

It is an arithmetic number, because the mean of its divisors is an integer number (563525020).

Almost surely, 2^3944278891 is an apocalyptic number.

3944278891 is a deficient number, since it is larger than the sum of its proper divisors (563921269).

3944278891 is a wasteful number, since it uses less digits than its factorization.

3944278891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56613.

The product of its digits is 3483648, while the sum is 55.

The square root of 3944278891 is about 62803.4942578835. The cubic root of 3944278891 is about 1579.9955790882.

The spelling of 3944278891 in words is "three billion, nine hundred forty-four million, two hundred seventy-eight thousand, eight hundred ninety-one".